Mundak Upanishad, is a part of the "Atharvaveda" - one of the 4 vedas. As per mythology, it is said to have been bestowed by Lord Brahma to Atharva - his Eldest son. The name of this "Upanishad" has been derived from the word "Mund", which literally means "to Shave". Accordingly, this Upanishad is supposed to remove ignorance.

This Upanishad is in the form of a "Mantra" or "Shlok", and divided into three chapters. Each of these chapters is known as a "Mundak". The Sub-section of these chapters is called a "Khanda". Total numbers of verses in the Upanishad are 64.

Mundak Upanishad delivers a sermon that there are two types of knowledge (Vidya). The first one is the higher class of knowledge, which is known as "Paara Vidya". Traditionally, this is recommended for the class of "Brahmans" only. "Apaara Vidya" is the second type of knowledge, which is graded lower then first one. This is recommended for the Physical world. It has all the knowledge evaluated and collected by human beings, like, phonetics, grammar, and etymology. All the teachings of "Veda" are also included in "Apaara Vidya"; only the true knowledge of Supreme Being is "Paara Vidya".
It deals with the concept of origination of "Universe" from an unmanifested source.